This bibliographic index includes systematic and stratigraphic entries on the species of North American archaeocyathids. Each entry consists of name, reference, stratigraphic and geographic location, and number and depository of cited specimens. Seventy-five species are recognized and distributed in twenty-six genera. Short sections on the definition, history, affinities and classification of archaeocyathids are included Topics: Sponges, Fossil, Paleontology -- North America
byNitecki, Matthew H; Williams, Patricia M. editor Managing Editor, Scientific Publications
Receptaculitaceae is considered an algal family within the order Dasycladales. The family is a coherent group that possesses anatomical characters common with the recent Dasycladales. the geographic and stratigraphic distribution of Silurian recetptaculitids is along the reef belt in a narrow zone from Iowa to Newfoundland. The ecological distribution of most Silurian species is within the reef complex; a few species are found in the carbonate inter-reef facies and a few in shaly rocks. -- The... Topics: Dasycladaceae, Fossil, Paleontology -- Silurian, Paleontology -- North America, Paleontology --...
byRigby, J. Keith; Nitecki, Matthew H., joint author
Fieldiana series has been published as Geological Series by Field Columbian Museum (1895-1909) and Field Museum of Natural History (1909-1943), and as Fieldiana: Geology by Chicago Natural History Museum (1945-1966) and Field Museum of Natural History (1966-) Topics: Sponges, Fossil -- North America, Paleontology -- Paleozoic, Paleontology -- North America
Cyclocrinitids are marine dasycladaceous algae of Ordovician and Silurian age. Their skeletal elements consist of a seldom calcified main axis on which lateral branches are borne in whorls. Calcified heads commonly form at the termini of the laterals. In North America cyclocrinitids are represented by three genera: Anomaloides, Cyclocrinites, and Lepidolites. Anomaloides (=Anomalospongia) possesses laterals calcified throughout their extent. They expand gently outward, and no heads form. Three... Topics: Dasycladaceae, Fossil, Paleontology -- Silurian, Paleontology -- Ordovician, Paleontology -- North...